VCCapture.cpp

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// ****************************************************************************
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//
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// ****************************************************************************
// ****************************************************************************
// Filename:  VCCapture.cpp
// Author:    Moritz Hassert
// Date:      2008
// ****************************************************************************


// ****************************************************************************
// Includes
// ****************************************************************************

#include <new> // for explicitly using correct new/delete operators on VC DSPs

#include "Helpers/helpers.h"

#define NEW_IMAGE_VAR
#include <vcrt.h>
#include <macros.h>
#include <sysvar.h>

#include "VCCapture.h"

#include <algorithm>



// ****************************************************************************
// Constructor / Destructor
// ****************************************************************************

CVCCapture::CVCCapture() : m_width(ScrGetColumns), m_height(ScrGetRows), m_pitch(ScrGetPitch)
{
}

CVCCapture::~CVCCapture()
{
        CloseCamera();
}


// ****************************************************************************
// Methods
// ****************************************************************************

bool CVCCapture::OpenCamera()
{
        //no cyclic image aquisition, keep current overlay status
        vmode( getvar(OVLY_ACTIVE) ? vmOvlStill : vmStill);
        tpwait(); //wait for vmode change. else first call to tpp() may fail
        return true;
}

void CVCCapture::CloseCamera()
{
        //restore live mode, keep current overlay status
        //setvar(IMODE, 0); does not work. WHY?
        vmode( getvar(OVLY_ACTIVE) ? vmOvlLive : vmLive);
}

bool CVCCapture::CaptureImage(CByteImage ** ppImages)
{
        //TODO: allow background image capture
        if (tpp() == -1)
                return false;

        //get the capture buffer address here and not in constructor as someone might have changed the location
        unsigned char* restrict scr_pixels = (unsigned char*) ScrGetCaptPage;
        unsigned char* restrict img_pixels = ppImages[0]->pixels;
        
        int h = std::min(m_height, ppImages[0]->height);
        int w = std::min(m_width,  ppImages[0]->width);

        //copy row by row as width may differ and pitch most likely will
        for (int row=0; row<h; row++) {
                std::copy(scr_pixels, scr_pixels+w, img_pixels);

                scr_pixels += m_pitch;
                img_pixels += ppImages[0]->width;
        }

        return true;
}

int CVCCapture::GetWidth()
{
        return m_width;
}

int CVCCapture::GetHeight()
{
        return m_height;
}

CByteImage::ImageType CVCCapture::GetType()
{
        //TODO: what about rgb vc cams?
        return CByteImage::eGrayScale;
}

int CVCCapture::GetNumberOfCameras()
{
        return 1;
}